The quick way to find a local Cellar & Basement Conversion specialist in Coulsdon

Sphere Construction Partnership

Cellar & Basement Conversion

View ProfileRequest a quote

Decades of Know-How Over 50 years of combined experience building and renovating homes. Proven Network Access to a wide network of specialist subcontractors across every trade, so no detail is overlooked. Competitive Timelines & Transparent Pricing We provide clear estimates and realistic schedules with full transparency.

RDG Home Extensions & Roofing Services

Cellar & Basement Conversion

View ProfileRequest a quote

Professional home extensions and roofing services across Surrey, London and the Home Counties. With over 30 years' experience, we specialise in single & double storey extensions, loft conversions, car ports, garages and garden rooms. Our roofing services include design and build of all roof types, fascias, soffits, guttering, repairs, cleaning and chimney maintenance.

Octopus Builders LTD

Cellar & Basement Conversion

(1) Read reviews

View ProfileRequest a quote

At OCTOPUSBUILDERSLIMITED, we pride ourselves on our extensive 16 years of experience in the construction industry. Our dedicated team works collaboratively to handle every aspect of your building project from A to Z. Whether it’s residential or commercial, we ensure quality craftsmanship and excellence in every job. Let us turn your vision into reality!

Latest homeowner review

Reviewed by NORMAN on 1/10/2024

Great job and would definitely rate it higher if I could. Will keep in mind if I need other jobs done around the house.

CPD LTD

Cellar & Basement Conversion

View ProfileRequest a quote

At CPD LTD, we proud our self on our can do attitude and good workmanship and this can be backed up by our good reviews across all platforms. we have over 30 years proven experience in bathroom design and installation, extensions, loft conversions, complete property refurbishment, kitchen design and installation, all aspects of plumbing, all aspects of drainage, Ground works.

CS

Cellar & Basement Conversion

View ProfileRequest a quote

Test test

K1 Building & Electrical Services

Cellar & Basement Conversion

(22) Read reviews

View ProfileRequest a quote07375763745

K1 Building and electrical is fully experienced building company supplying the full range of building sevices . We aim to give the highest standard of work we can to every customer . As a long standing building company we have made some great partnerships with othe trades and we can now offer the full building package with K1 taking care of the management so we can get the project finished with out all the hassle of you the client looking for separate trades. We have now completed a full range of building projects and can supply loads of references and photos. We look foward to completing your project to our highest standards.

Latest homeowner review

Reviewed by Kay on 12/3/2026

Kaz installed 6 Fire Rated doors to the specification we agreed.

Time Build

Cellar & Basement Conversion

(4) Read reviews

View ProfileRequest a quote07795054300

Established since 2001, I have delivered a variety of building projects efficiently, economically and stress free to very high standard. My services include Space Planning, Design & Build, Site Management (ACIOB). Project Management, Renovations and Refurbishment of both domestic and commercial properties. I pride my self on my ability to deliver the required project to the specified quality within the agreed duration & budget with a courteous and friendly approach throughout.

Latest homeowner review

Reviewed by Richard on 9/12/2023

Very good, fast efficient and clean, Definitely recommend, Thank you Khal very happy with my new unit.

Rated People

Cellar & Basement Conversion

View ProfileRequest a quote

Loft conversion specialist, with 25 years worth of experience.

Block Construction

Cellar & Basement Conversion

(3) Read reviews

View ProfileRequest a quote

With over twenty years in the building trade, Block construction have a wealth of knowledge in the residential and commercial building industry. Experienced in in undertaking all aspects of building work from new builds to extensions,to internal alterations. We ensure a fast, efficient and comprehensive service through our team of highly skilled and experienced professionals covering all your property requirements. Combined with our local knowledge and expertise our team ensures a swift and direct response to our customers needs.

Latest homeowner review

Reviewed by Kai on 7/8/2020

Joe has done a fantastic job for us. He was very much attention to detail and also explained very well during the whole process. His work comes out at the end was very good. We satisfied with his work and would definitely use him again in future

C.G.P.Services

Cellar & Basement Conversion

(38) Read reviews

View ProfileRequest a quote

Hello, my name is Anthony, but you can call me Tony, I've been working for myself now for just over Ten year's I've only just joined this site. Hence, no ratings trying to recover all old photos of my old phone, which i broke in lock down.ive never needed to advertise work found me.. now everything is online, so I wanted to give this site a try,I don't dress to impress I dress to work...I'm 48 my to kids are now 28,30 two lovely grandkids Tony

Latest homeowner review

Reviewed by Jason on 16/8/2025

Azzep Building Services

Cellar & Basement Conversion

(29) Read reviews

View ProfileRequest a quote

We offer a full and comprehensive range of residential and commercial building services like bathrooms, kitchen,patios,loft conversion,extensions ,internal and external building work.More than 20 years of experience and highly quality construction

Latest homeowner review

Reviewed by denny on 22/12/2019

Excellent, from start to finish. Very professional. Cesar and his partner were excellent in their work. I'm giving them 100% Feedback and will be keeping their number.

Super Smart Builders Limited

Cellar & Basement Conversion

(21) Read reviews

View ProfileRequest a quote07796697462

From stunning home extensions to innovative loft conversions, our expert team transforms properties across London , Kent , Essex and surrounding areas with nearly three decades of trusted craftsmanship. From concept to completion, we bring over 25 years of expertise to every project across. Extensions Add the space you need with extensions that complement your home . Loft Conversions Turn your unused loft into a functional room that adds real value to your property. Renovations Refresh and modernise your home with renovations that make a real difference. General Building From repairs to major building work, we handle projects of all sizes with care. New Builds Complete new property construction built to your specifications and the highest standards.

Latest homeowner review

Reviewed by Annabel on 15/7/2026

Arnie was a great builder to work with throughout the kitchen and bathroom renovation. He did an excellent job, took the time to understand exactly what we wanted to achieve and had great attention to detail and worked with us to ensure we could stay within budget. It was our first time renovating a property and Arnie was incredibly helpful and reliable. I would definitely recommend working with him.

Carswells Plumbing

Cellar & Basement Conversion

(7) Read reviews

View ProfileRequest a quote07809473255

Carswells construction & plumbing has been established over 10 year for a during that period of time we have built our business on reputation, word of mouth and dedication in order to provide our customers with the best possible services in all Building works specialise in extensions all building work & bathroom fitting.

Latest homeowner review

Reviewed by P on 20/10/2024

I recently had Luke and his team widen an opening between two rooms in my property, which was a sizeable job requiring the installation of a steel beam. The work was managed efficiently, and great care was taken throughout the project. I’m very pleased with the results and would highly recommend Luke and his team for their professionalism and attention to detail.

JNM CONSTRUCTION SERVICES

Cellar & Basement Conversion

(145) Read reviews

View ProfileRequest a quote

sole trader operation with over 35 yrs continuous experience. trade indentured, city&guilds1st and time served.all aspects of brickwork with particular concentration to repointing, restoration,strengthening& surface cleaning.all lime& Portland mortar done

Latest homeowner review

Reviewed by Heath on 15/1/2026

Ion Seremet

Cellar & Basement Conversion

(32) Read reviews

View ProfileRequest a quote07710686128

hello, I am a responsible person, I have more than 10 years of experience in construction, painting and decorating, flooring, tiling, carpentry, plumbing, and more... I do my best to keep the client happy... contact me if you want a good quote for your work! I Regards:ION

Latest homeowner review

Reviewed by Trish on 15/2/2026

Ion did a wonderful job on our bathroom. He completely removed the entire existing bathroom back to the joists and rebuilt a beautiful shower room. I found him to be honest, trustworthy, hardworking and reasonably priced. I couldn’t recommend him higher.

Quinn

Cellar & Basement Conversion

(61) Read reviews

View ProfileRequest a quote

Quinn construction Ltd general building works, specialize in Knockthrough, garage conversions and chimney breast and stack removal

Latest homeowner review

Reviewed by Srinivas on 18/11/2025

Highly recommend Ben for plumbing and rendering work! He did a fantastic job — everything was completed to a high standard, on time, and within budget. Very honest, easy to communicate with, and offered practical solutions without upselling. His pricing was fair and transparent, and the quality of work speaks for itself. It’s rare to find someone so reliable and skilled these days — will definitely be using him again!